sysutils/nnn: update to 2.8

Changes:
 - sessions (thanks @annagrram)
 - rclone support for remote access (mount any cloud storage!!!)
 - toggle selection with 'Space' or '^J'
 - ignore events during selection so the + symbol is not lost
 - run custom (non-shell-interpreted) commands like plugins
 - configure cd-on-quit as the default behaviour
 - create parent dirs for new files and dirs, duplicate a file/dir
   anywhere
 - 'copy/move as' workflow (thanks @KlzXS)
 - edit , flush selection buffer (thanks @KlzXS)
 - support xargs with minimal options (as in BusyBox) (thanks @KlzXS)
 - changed the key to size sort to 'z'
 - additional key ']' to show command prompt
 - mount archives using archivemount
 - smoother double click handling
 - program option -R to disable rollover at edges
 - keybind collision checker (for custom keybind config) (thanks
   @annagrram)
 - show size of file in bytes in status bar in disk usage mode
 - pass unresolved path as second argument ($2) to plugin
 - mechanism for plugins to control active directory
 - all binary questions are confirmed by 'y' or 'Y'
 - plugins
   - some plugins renamed
   - integrated shellcheck in CI, POSIX-compliance fixes (thanks
     @koalaman)
   - getplugs - detect modifications in exiting plugin file (thanks
     @KlzXS)
   - drag-file & drop-file: drag & drop files using dragon
   - gutenread: browse, download and read from Project Gutenberg
   - suedit - edit file with superuser permissions
   - fzhist - fuzzy select commands from history, edit and run
   - fzcd - change to a fuzzy-searched directory
   - rename - batch rename directory or selection using qmv or vidir
   - pskill - fuzzy list a process or zombies by name and kill
   - exetoggle - toggle executable status of hovered file
   - treeview - informative tree output with file permissions and size
   - chksum - recursively calculate checksum for files in hovered
     directory
   - fzopen renamed to fzopen
   - imgsxiv instructions added to browse and rename images
 - create link to current file
 - additional key ';' to execute plugin
 - more explicit force removal message
 - force non-detachable internal edits in $EDITOR (option -E)
 - export current file as $nnn (instead of $NN)
 - fix file open failure from browser when configured as default FM

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